Three-dimensional puzzle



FIG. 1 is a top plan view of a three dimentional puzzle embodying my design;

FIG. 2 is a front view of the three-dimensional puzzle as seen in FIG. 1, the rear and side views being identical thereto; and,

FIG. 3 is the bottom plan view thereof. 

The ornamental design for a three-dimensional puzzle, as shown and described. 